Javascript works hand in hand with the DOM as we know. So how about changing text and information within the DOM. Well we can easily do this by targeting an object that represents a DOM element in Javascript and modify the innerHTML and innerText properties.
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Hey ninjas, in this JavaScript tutorial, we'll be looking again at the setAttribute method to control in-line styling of our HTML elements, as well as utilizing the 'style' property that all DOM objects have access to.
If you have any questions at all, fire away :).
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A simple video showing how to change the CSS of an element by assigning it an ID and using the click of a button.
In this example we will be changing the font size of a p tag, it will be changing from a smaller text to a larger text once the button is clicked.
Comment below if you have any other questions and I'll be more than happy to help you out. Also comment below for any future videos you would like to see!
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Lesson Code: http://www.developphp.com/video/JavaScript/Change-Style-Sheet-Using-Tutorial-CSS-Swap-Stylesheet
Learn to change the entire style of your web page with a click using JavaScript that is targeting the href attribute of your familiar link element using the setAttribute method of JavaScript. DEMO: http://www.adamkhoury.com/demo/js_swap_css_stylesheet/

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In this JavaScript tutorial you will learn how to change CSS using JavaScript as well as creating CSS.
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Yo ninjas! In this JavaScript tutorial, I'll be showing you how to change your web page content on the fly via the DOM. To do this, we must follow two steps:
1. Reach into the page and grab a node / element
2. Change the property of that note (either innerHTML or textContent).
In this video, I do sometimes refer to these properties as methods - that is my mistake, although the concept is still very clear to see.
If you have any questions, fire away :).
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Events are listening out for interactivity by the user. It also could include a change in state; for example you could trigger an event if the HTML5 video player was playing, paused or in the stop position. This allows us to create interactive pages and show, hide or update content to notify the user. This is why it's so important to understand events.
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Tutorial: How to use Javascript to change style of HTML elements, by using element id and by walking the document object model from a selected starting point.
How to use Javascript to chenge the content of an element or add content to existing content in an element.

In this tutorial I show you how to change images in JavaScript changing the value of the "src" property.
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Lesson Code: http://www.developphp.com/view.php?tid=1208
Learn how to use the Javascript addEventListener() method for an optimal way of adding user interactivity into your HTML4 and HTML5 websites and web applications that apply Javascript.

Sorry, I had to re-upload this because I had an error with it.
--------------------------------------------------------------------------------------------------
This is how you change the style in an HTML document using JavaScript. I recommend that you know how to set up an HTML, a CSS and a JavaScript file before viewing this video. Anyhow, Good luck!

In this video I will show you changing CSS with javascript. I will show you that how can you change background color with javascript, change font size with javascript, change background color of body with javascript.
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change div className Using Javascript
Source Code: http://1bestcsharp.blogspot.com/2017/01/javascript-change-class-name.html
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In This Javascript Tutorial we will see How To Change DIV Css Class Name In JS Using Netbeans Editor ..
More Javascript Tutorials :
How to get value of selected radio button
https://www.youtube.com/watch?v=uzwUBDQfpkU
How to append Value to an array
https://www.youtube.com/watch?v=KVdY8n6lCy4
javascript images slider 1
https://www.youtube.com/watch?v=QkcemPr4xaU
Convert String To Number
https://www.youtube.com/watch?v=JMfZG7o_QtE
JavaScript Show And Hide Input Password Text
https://www.youtube.com/watch?v=Cmo9sjx5eFE
using checkbox with js
https://www.youtube.com/watch?v=yFYEHSh2iTQ
get And Set Value To An Input
https://www.youtube.com/watch?v=AfRHl3soLDg

Yo ninjas, so in this javascript lesson I want to build on the last tutorial by introducing the getAttribute and setAttribute methods for changing the attributes on your HTML elements.
getAttribute allows us to read the value of any given attribute, and setAttribute allows us to set the attribute value to whatever we want.
If you have any questions, fire away :)
DOM OBJECT METHODS AND PROPERTIES - http://www.w3schools.com/jsref/dom_obj_all.asp
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Link for all dot net and sql server video tutorial playlists
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Link for slides, code samples and text version of the video
http://csharp-video-tutorials.blogspot.com/2015/01/assigning-event-handlers-in-javascript.html
In JavaScript there are several ways to associate an event handler to the event. In Part 36, we discussed, associating event handler methods to events using the attributes of HTML tags. In this video we will discuss using DOM object property to assign event handlers to events.
First let us understand, what is DOM
DOM stands for Document Object Model. When a browser loads a web page, the browser creates a Document Object Model of that page. The HTML DOM is created as a tree of Objects.
Example :
[html]
[head]
[title]My Page Title[/title]
[/head]
[body]
[script type="text/javascript"]
[/script]
[div]
[h1]This is browser DOM[/h1]
[/div]
[/body]
[/html]
JavaScript can be used to access and modify these DOM objects and their properties. For example, you can add, modify and remove HTML elements and their attributes. Along the same lines, you can use DOM object properties to assign event handlers to events. We will discuss the DOM object in detail in a later video session.
We will continue with the same examples that we worked with in Part 36. Notice that in this case, we are assigning event handlers using the DOM object properties (onmouseover & onmouseout) instead of using the attributes of the HTML tag. We are using this keyword to reference the current HTML element. In this example "this" references the button control.
[input type="button" value="Click me" id="btn"/]
[script type="text/javascript"]
document.getElementById("btn").onmouseover = changeColorOnMouseOver;
document.getElementById("btn").onmouseout = changeColorOnMouseOut;
function changeColorOnMouseOver()
{
this.style.background = 'red';
this.style.color = 'yellow';
}
function changeColorOnMouseOut()
{
this.style.background = 'black';
this.style.color = 'white';
}
[/script]
The following example is same as the above. In this case we are assigning an anonymous function to onmouseover & onmouseout properties.
[input type="button" value="Click me" id="btn" /]
[script type="text/javascript"]
document.getElementById("btn").onmouseover = function ()
{
this.style.background = 'red';
this.style.color = 'yellow';
}
document.getElementById("btn").onmouseout = function ()
{
this.style.background = 'black';
this.style.color = 'white';
}
[/script]
If an event handler is assigned using both, i.e an HTML attribute and DOM object property, the handler that is assigned using the DOM object property overwrites the one assigned using HTML attribute. Here is an example.
[input type="button" value="Click me" id="btn" onclick="clickHandler1()"/]
[script type="text/javascript"]
document.getElementById("btn").onclick = clickHandler2;
function clickHandler1()
{
alert("Handler set using HTML attribute");
}
function clickHandler2()
{
alert("Handler set using DOM object property");
}
[/script]
Using this approach you can only assign one event handler method to a given event. The handler that is assigned last wins. In the following example, Handler2() is assigned after Handler1. So Handler2() owerites Handler1().
[input type="button" value="Click me" id="btn"/]
[script type="text/javascript"]
document.getElementById("btn").onclick = clickHandler1;
document.getElementById("btn").onclick = clickHandler2;
function clickHandler1()
{
alert("Handler 1");
}
function clickHandler2()
{
alert("Handler 2");
}
[/script]

Lesson Code: http://www.developphp.com/video/JavaScript/Form-Select-Change-Dynamic-List-Option-Elements-Tutorial
In this Javascript video lesson you will learn how to program dynamic select form list elements. To demonstrate the logic we will show how to change options of a select list based on the selection the user makes from the first list. A web application developer will definitely need to know how to do this when they get into form programming that involves data intake of categories and subcatories from a user.

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Link for slides, code samples and text version of the video
http://csharp-video-tutorials.blogspot.com/2015/01/events-in-javascript.html
What is an event
An event is a signal from the browser that something has happened. For example,
1. When a user clicks on an HTML element, click event occurs
2. When a user moves the mouse over an HTML element, mouseover event occurs
When events occur, we can execute JavaScript code or functions in response to those events. To do this we need to associate JavaScript code or functions to the events. The function that executes in response to an event is called event handler.
In JavaScript, there are several ways to associate an event handler to the event
1. Using the attributes of an HTML tag
2. Using DOM object property
3. Using special methods
In this video we will discuss associating event handler methods to events using the attributes of HTML tags.
In the following example, the code to execute in response to onmouseover & onmouseout events is set directly in the HTML markup. The keyword "this" references the current element. In this example "this" references the button control.
[input type="button" value="Click me" id="btn"
onmouseover="this.style.background= 'red'; this.style.color = 'yellow'"
onmouseout="this.style.background= 'black'; this.style.color = 'white'" /]
The above example, can be rewritten as shown below. In this case the code to execute in response to the event is placed inside a function and then the function is associated with the event.
[input type="button" value="Click me" id="btn"
onmouseover="changeColorOnMouseOver()"
onmouseout="changeColorOnMouseOut()" /]
[script type="text/javascript"]
function changeColorOnMouseOver()
{
var control = document.getElementById("btn");
control.style.background = 'red';
control.style.color = 'yellow';
}
function changeColorOnMouseOut()
{
var control = document.getElementById("btn");
control.style.background = 'black';
control.style.color = 'white';
}
[/script]
Events are very useful in real-world applications. For example they can be used to
1. Display confirmation dialog box on submitting a form
2. Form data validation and many more
How to show confirmation dialog in JavaScript
[input type="submit" value="Submit" id="btn" onclick="return confirmSubmit()" /]
[script type="text/javascript"]
function confirmSubmit()
{
if (confirm("Are you sure you want to submit"))
{
alert("You selected OK");
return true;
}
else
{
return false;
confirm("You selected cancel");
}
}
[/script]
JavaScript form validation example : In this example, both First Name and Last Name fields are required fields. When you type the first character in any of the textbox, the background colour is automatically changed to green. If you delete all the characters you typed or if you leave the textbox without entering any characters the background colour changes to red indicating the field is required. We made this possible using onkeyup and onblur events.
onkeyup occurs when the user releases a key.
onblur occurs when an element loses focus.
[table]
[tr]
[td]
First Name
[/td]
[td]
[input type="text" id="txtFirstName" onkeyup="validateRequiredField('txtFirstName')"
onblur="validateRequiredField('txtFirstName')"/]
[/td]
[/tr]
[tr]
[td]
Last Name
[/td]
[td]
[input type="text" id="txtLastName" onkeyup="validateRequiredField('txtLastName')"
onblur="validateRequiredField('txtLastName')"/]
[/td]
[/tr]
[/table]
[script type="text/javascript"]
function validateRequiredField(controlId)
{
var control = document.getElementById(controlId);
control.style.color = 'white';
if (control.value == "")
{
control.style.background = 'red';
}
else
{
control.style.background = 'green';
}
}
[/script]

Lesson Code: http://www.developphp.com/video/JavaScript/Window-Size-Responsive-CSS-Layout-Stylesheet-Change-Tutorial
Learn to program layout response to screen view or window size changes using JavaScript to affect the CSS Stylesheet link element in the document. The script also handles layout adjustment when the document is initially loading.

You can change the text of HTML by button click with the help of JavaScript.
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In this video, you will learn how to manipulate CSS properties using JavaScript. This video will guide you to pickup the HTML element whose CSS property you wish to manipulate using JavaScript.
You will learn about document.getElementById and it various option.

Change your footers year every year automatically by using the Javascript date constructor to check the year. This simple video will show you how to use the date object in javascript and display it to the DOM.
MDN Documentation - https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date
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Jquery/Javascript - Update/Change alternate div color using css(step-by-step)
Today, we will learn how to update alternate div background class using jquery/javascript.
It is very simple and easy to do it. For that, we have to write some lines of code as in below example. We have to take care of that, this code will execute once the page is fully loaded. For that, we have to use document.ready function.
You can download sample code from https://goo.gl/DEqN2k

In this video I am going to show you how to change a background color by one click by using HTML5 , CSS3 and javascript........
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